如何通过文件关联执行已启动应用程序的事件？
在尝试了一个新的 Windows 窗体项目后，我发现当您将文件类型与 Windows 中的可执行文件关联时，您可以使用 args[0] 找到启动应用程序的文件的文件路径from static void Main(string[] args)
如果应用程序已打开，双击文件时是否可以在应用程序上启动事件？ （显然 Main(string[] args) 不会被触发）。
我尝试复制的应用程序行为示例：
- 用户打开 GIMP（在 Windows 中）
- 用户打开资源管理器并右键单击 .png 文件
- 用户选择使用 GIMP 打开 GIMP
- 不是创建新的 GIMP 应用程序实例，而是在已打开的 GIMP 实例中的新窗口。
在这种情况下，GIMP 是否使用多个应用程序来接受通过文件关联“打开”的文件？或者是否可以使用单个应用程序“实例”来完成此操作。
我在这方面遇到了麻烦，因为我的大多数搜索倾向于引导我作为 Windows 用户进行文件关联（即“如何将 .xls 文件与 Excel 关联”文章）。
After playing around with a new Windows Form project, I discovered that when you associate a file type with an executable in Windows, you can find the file path of the file that launched the application using args[0] from static void Main(string[] args)
Is it possible to launch an event on your application when you double click a file if your application is already open? (As obviously Main(string[] args) won't be triggered).
Example of an application with behavior I am attempting to replicate:
- User Opens GIMP(in Windows)
- User opens explorer and right clicks a .png file
- User selects open with GIMP
- Instead of creating a new application instance of GIMP, GIMP opens the picture in a new window within the instance of GIMP that was already opened.
In this case is GIMP employing multiple applications to accept files "opened" with file association? Or is it possible to do it with a single application "instance".
I'm having trouble with this as most of my searches tend to lead me towards file association as a Windows user (i.e. "How to associate .xls files with excel" articles).
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有多种选择，但没有一个是免费的。
Main()可以检测到另一个副本已在运行，并通过您确定的某种方式将文件名传递给已在运行的副本。考虑到您的限制，选项 (1) 似乎是最佳选择。
There are a variety of options, but none of them come for free.
Main()can detect that there is another copy already running and hand the file name off to the already-running copy by some means you determine.Given your constraints, option (1) appears to be the best option.
雷蒙德当然是对的，但如果您正在寻求实施选项（1）的帮助，您可能应该查看 创建单实例应用程序的正确方法是什么？ 和 .NET 4 单一应用程序实例 和 切换到同一应用程序的其他实例
您会注意到检测应用程序非常简单（使用互斥锁）。引入其他应用程序并向其发送文件名可能更具挑战性。
前面链接的问题的答案中提供了三种基本解决方案
使用
PostMessage向第一个实例发送消息。这使用了 HWND_BROADCAST ，这可能会产生意想不到的后果。使用 Microsoft.VisualBasic.ApplicationServices.ApplicationBase< /a> 当然，对 VisualBasic 的引用会让一些 C# 开发人员感到不安。
使用
FindWindow依赖于 Windows 名称。还值得注意的是，如果您希望现有应用程序位于前面，则需要特别小心，因为设置前景只能被放弃而不能被夺走。请参阅 前台激活权限就像爱：你不能偷了它，它必须给你和AllowSetForegroundWindow 和 设置前景窗口
Raymond is right of course, but if you're looking for help with the implmentation of option (1) you should probably look at What is the correct way to create a single instance application? and .NET 4 single application instance and Switch to other instance of same application
You'll notice that detecting the application is pretty easy (use a mutex). Bringing the other application and sending it a filename can be more challenging.
There are three basic solutions presented in the answers to the previously linked questions
Use
PostMessageto send a message to 1st instance. This usesHWND_BROADCASTwhich can have untended consequences.Use Microsoft.VisualBasic.ApplicationServices.ApplicationBase Of course a reference to VisualBasic gives some C# devs the willies.
Use
FindWindowwhich relies on a Windows Name.Its also worth noting that if you want the existing application to be in the front you'll need to take special care because setting the foreground can only be given away not taken. See Foreground activation permission is like love: You can't steal it, it has to be given to you and AllowSetForegroundWindow and SetForegroundWindow
Microsoft 为 Visual Basic .Net 创建了此功能，C# 也可以使用它。
请参阅以下文章，了解 C# 中的简单示例：
http://www.openwinforms.com/single_instance_application.html< /a>
Microsoft created this functionality for Visual Basic .Net, and it can be used by C# too.
See the following post for a simple example in C#:
http://www.openwinforms.com/single_instance_application.html
这种方法最适合我：强制执行单实例 WPF 应用程序。
特别是，其传递参数的解决方案也适用于仅通知图标的应用程序。
This approach worked best for me: Enforcing Single Instance WPF Applications.
Especially, its solution for passing arguments also works in notify-icon only applications.